Compilare: user.c: In function ‘main’: user.c:46:3: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(ult, -1, sizeof ult); ^ user.c:46:3: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:44:35: warning: unused variable ‘aux’ [-Wunused-variable] int n, m, i, x, y, dr = 0, poz, aux; ^ user.c:45:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.c:48:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &x, &y); ^